Читать книгу X-Ray Fluorescence in Biological Sciences - Группа авторов - Страница 78

Two to four grams of hair samples is required for the determination of As concentration in an exposed person. A stainless‐steel scissor was used to collect the hair sample obtained from different parts of the scalp at an interval of 1 cm. Collected hair samples, preserved in zipper polyethylene bags, were cut into small pieces, washed with a sufficient volume of acetone for a couple of minutes, and then thoroughly washed again several times with deionized water, and finally washed once more with acetone [5]. The sample was preliminarily air dried at room temperature for about three hours, and then again in an oven at 180 °C until the sample was completely dry.